2. A Brief History of Mobile Phones
The development of the smartphone dates back to 1959. That was when the MOSFET, a type of transistor, was built. This device is the basis of all computing devices.
The technology that was advanced through MOSFET led to the building of wireless mobile networks, which are required to operate a smartphone. Because of that technology, several wireless mobile networks were built in the late 1990s, and by the early 2000s, advances had been made to increase bandwidth. Additionally, the lithium-ion battery was invented in the 1980s, commercialized in the 1990s, and became the primary energy source for smartphones.